Sand-point.



Patentd July 30, l90l.

/NVENTO/7 J Z B) ATTORNEYS M. LATTA.

SAND POINT.

(Application filed Feb. 4, 1901.)

(No Model.)

WITNESSES:

w: nuams Pnsws co. noroumo, wumnorou, n. c

UNTTED STATES PATENT OFFICE.

MILTON LATTA, OF BURWELL, NEBRASKA.

SAN D-POINT.

SPECIFICATION formingpart of Letters Patent No. 679,681, dated July 30,1 901. Application filed February 4, 1901. Serial Nd 45,840. (No model.)

To ctZZ whom, it may concern:

Be it known that I, MILTON LATTA, a citizen of the United States,residing at Burwell, in the county of Garfield and State of Nebraska,have made certain new and useful Improvements in Sand-Points, of whichthe following is a specification.

This invention is an improvement in sandpoints for wells, andparticularly in such points which are formed with perforations, a spiralrib extending around the perforated portion, and with a wire-clothstrainer secured upon the said rib over the perforated portion; and thepresent invention has for an object to provide an improved constructionand arrangement of the wirecloth with a view to securing distribution ofthe strain or pressure upon all the wires of the cloth so such strain orpressure will be distributed between the wires of such cloth which crosseach other at right angles.

Theinvention consists in certain novel constructions and combinations ofparts, as will be hereinafter described and claimed.

In the drawings, Figure 1 is a side view of a point embodying myinvention. Fig. 2 is a cross-section on about line 2 2 of Fig. 1. Fig. 3is a longitudinal section, enlarged, on about line 3 3 of Fig. 1; andFig. 4 is a detail view of a portion of the wire-cloth strip employed inthe construction of the improved point. I

The sand-point, as shown, is formed with a perforated tube A, upon whichis formed or otherwise provided the spiral rib A, extending along theperforated portion of the tube, forming a spiral recess, in the base ofwhich are arranged the perforations B, as shown. The point as thusconstructed may be generally of the ordinary form, and it is usual toprovide a wire-cloth strainer over the point, resting upon the ribs andinclosing the space between the said ribs. Ordinarily this strainer hasbeen formed from a strip of Wirecloth which is laid longitudinallyparallel to the axis of the tube and bent around the same and secured atits edges. This construction has provcn objectionable and defective inpractice because the inward pressure or strain has been borne to a greatextent on the wires, which extend in the direction of length of thestrain of inward pressure will be borne equally by both sets of strands.I also wind the cloth strip spirally upon the sand-point, over the ribsthereof, thus avoiding any seam in the direction of the axis of the tubeand enabling me to secure the Wire cloth in place in a stronger bettermanner than when such cloth is held upon the tube in the direction ofits length and bent around the same in the ordinary way. I secure theseresults by employing the wire-cloth strip 0, (shown in Fig. 4,) Whosestrands O and 0 cross each other at right angles. This strip 0 is woundspirally upon the sand-point, over the ribs thereof, as shown, and issuitably secured, preferably by soldering its edges together and bysoldering or otherwise suitably securing the strip at its opposite ends.When thus secured, as shown in Fig. 1, the spiral strip will be held atboth ends and throughout its spiral length, so that if it should getloose at any point it will not spread open, but will be held by thefastenings at other points snugly and firmly to the body of thesand-point.

In the construction shown it Will be noticed that the convolutions ofthe spirallywound wire-cloth are so arranged that the edges of the clothstrip lie upon the spiral ribs of the tube, thus facilitating thesoldering of the edges of the spiral cloth together and also enablingthe fastening of the cloth to the tube, as will be readily understoodfrom the drawings. By preference the spiral ribs are secured by theconstruction shown, in which I employ a galvanized wire of suitablesize, which is wound upon the perforated tube, as best shown in Figs. 1and 3, and operates efficiently to hold the Wire screen above the outersurface of the tube. The spiral ribs form little ditches, and the Waterstrains through the whole face of the strainer, filling the ditches, andthe water runs around the tube until it passes through one of theperforations into the tube.

Having thus fully deseribed' my invention, what I claim as new, anddesire to secure by Letters Patent, is

'1. A sand-poiu t, consisting of the perforated tube, the spiral ribthereon, and the strainer consisting of the strip of Wil'QiClObh' Woundspirally upon the tube, "over the spiral rib, thereon, having the edgesof such cloth lapped upon the said rib and secured, the strands of suchstrainer being arranged to extend between the convolutious of the rib atapproximately the same angle, whereby to seeure an equal distribution ofthe strain, substantially as and for the purposes set forth.

2.- Asand-pjoint' consisting of the perforated tubehayifig-a spiral ribon its outer side, a strainer consisting of a foraminated strip of awidth to extend between the spiral ribs and wound spirally on said ribsin the same direction as and at the same pitch as the said ribs andhaving their edges united together and upon the crowns of the said ribssubstantially' as and for the purposes set forth.

MILTON LATTA.

Witnesses:

O. 0. BROWN, LOTT FILLMORE.

